Thanks for responding.
Based on what I understand, someone was saying it's best to make WordPress my main website and setting up a subdomain specifically for my billing portal using WHMCS.
This approach is said to streamline operations, as WordPress offers user-friendly content management and excellent SEO capabilities, helping to increase the site's visibility.
I was told that separating the billing system onto a subdomain (e.g., billing.mydomain.com) can enhance security by isolating sensitive data and allowing for tailored security measures.
If I could get some feedback on this, it would be great.